1 /* 2 * 3 * device driver for philips saa7134 based TV cards 4 * video4linux video interface 5 * 6 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs] 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include "saa7134.h" 20 #include "saa7134-reg.h" 21 22 #include <linux/init.h> 23 #include <linux/list.h> 24 #include <linux/module.h> 25 #include <linux/kernel.h> 26 27 /* ------------------------------------------------------------------ */ 28 29 static unsigned int vbi_debug; 30 module_param(vbi_debug, int, 0644); 31 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]"); 32 33 static unsigned int vbibufs = 4; 34 module_param(vbibufs, int, 0444); 35 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32"); 36 37 #define vbi_dbg(fmt, arg...) do { \ 38 if (vbi_debug) \ 39 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \ 40 } while (0) 41 42 /* ------------------------------------------------------------------ */ 43 44 #define VBI_LINE_COUNT 17 45 #define VBI_LINE_LENGTH 2048 46 #define VBI_SCALE 0x200 47 48 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf, 49 int task) 50 { 51 struct saa7134_tvnorm *norm = dev->tvnorm; 52 53 /* setup video scaler */ 54 saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff); 55 saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8); 56 saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff); 57 saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8); 58 saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff); 59 saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8); 60 saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff); 61 saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8); 62 63 saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff); 64 saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8); 65 saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00); 66 saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00); 67 68 saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff); 69 saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8); 70 saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff); 71 saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8); 72 73 saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00); 74 } 75 76 /* ------------------------------------------------------------------ */ 77 78 static int buffer_activate(struct saa7134_dev *dev, 79 struct saa7134_buf *buf, 80 struct saa7134_buf *next) 81 { 82 struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv; 83 unsigned long control, base; 84 85 vbi_dbg("buffer_activate [%p]\n", buf); 86 buf->top_seen = 0; 87 88 task_init(dev, buf, TASK_A); 89 task_init(dev, buf, TASK_B); 90 saa_writeb(SAA7134_OFMT_DATA_A, 0x06); 91 saa_writeb(SAA7134_OFMT_DATA_B, 0x06); 92 93 /* DMA: setup channel 2+3 (= VBI Task A+B) */ 94 base = saa7134_buffer_base(buf); 95 control = SAA7134_RS_CONTROL_BURST_16 | 96 SAA7134_RS_CONTROL_ME | 97 (dmaq->pt.dma >> 12); 98 saa_writel(SAA7134_RS_BA1(2), base); 99 saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen); 100 saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen); 101 saa_writel(SAA7134_RS_CONTROL(2), control); 102 saa_writel(SAA7134_RS_BA1(3), base); 103 saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen); 104 saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen); 105 saa_writel(SAA7134_RS_CONTROL(3), control); 106 107 /* start DMA */ 108 saa7134_set_dmabits(dev); 109 mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT); 110 111 return 0; 112 } 113 114 static int buffer_prepare(struct vb2_buffer *vb2) 115 { 116 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 117 struct saa7134_dev *dev = dmaq->dev; 118 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 119 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 120 struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0); 121 unsigned int size; 122 123 if (dma->sgl->offset) { 124 pr_err("The buffer is not page-aligned\n"); 125 return -EINVAL; 126 } 127 size = dev->vbi_hlen * dev->vbi_vlen * 2; 128 if (vb2_plane_size(vb2, 0) < size) 129 return -EINVAL; 130 131 vb2_set_plane_payload(vb2, 0, size); 132 133 return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents, 134 saa7134_buffer_startpage(buf)); 135 } 136 137 static int queue_setup(struct vb2_queue *q, 138 unsigned int *nbuffers, unsigned int *nplanes, 139 unsigned int sizes[], struct device *alloc_devs[]) 140 { 141 struct saa7134_dmaqueue *dmaq = q->drv_priv; 142 struct saa7134_dev *dev = dmaq->dev; 143 unsigned int size; 144 145 dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1; 146 if (dev->vbi_vlen > VBI_LINE_COUNT) 147 dev->vbi_vlen = VBI_LINE_COUNT; 148 dev->vbi_hlen = VBI_LINE_LENGTH; 149 size = dev->vbi_hlen * dev->vbi_vlen * 2; 150 151 *nbuffers = saa7134_buffer_count(size, *nbuffers); 152 *nplanes = 1; 153 sizes[0] = size; 154 return 0; 155 } 156 157 static int buffer_init(struct vb2_buffer *vb2) 158 { 159 struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv; 160 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2); 161 struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2); 162 163 dmaq->curr = NULL; 164 buf->activate = buffer_activate; 165 return 0; 166 } 167 168 struct vb2_ops saa7134_vbi_qops = { 169 .queue_setup = queue_setup, 170 .buf_init = buffer_init, 171 .buf_prepare = buffer_prepare, 172 .buf_queue = saa7134_vb2_buffer_queue, 173 .wait_prepare = vb2_ops_wait_prepare, 174 .wait_finish = vb2_ops_wait_finish, 175 .start_streaming = saa7134_vb2_start_streaming, 176 .stop_streaming = saa7134_vb2_stop_streaming, 177 }; 178 179 /* ------------------------------------------------------------------ */ 180 181 int saa7134_vbi_init1(struct saa7134_dev *dev) 182 { 183 INIT_LIST_HEAD(&dev->vbi_q.queue); 184 setup_timer(&dev->vbi_q.timeout, saa7134_buffer_timeout, 185 (unsigned long)(&dev->vbi_q)); 186 dev->vbi_q.dev = dev; 187 188 if (vbibufs < 2) 189 vbibufs = 2; 190 if (vbibufs > VIDEO_MAX_FRAME) 191 vbibufs = VIDEO_MAX_FRAME; 192 return 0; 193 } 194 195 int saa7134_vbi_fini(struct saa7134_dev *dev) 196 { 197 /* nothing */ 198 return 0; 199 } 200 201 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) 202 { 203 spin_lock(&dev->slock); 204 if (dev->vbi_q.curr) { 205 /* make sure we have seen both fields */ 206 if ((status & 0x10) == 0x00) { 207 dev->vbi_q.curr->top_seen = 1; 208 goto done; 209 } 210 if (!dev->vbi_q.curr->top_seen) 211 goto done; 212 213 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE); 214 } 215 saa7134_buffer_next(dev, &dev->vbi_q); 216 217 done: 218 spin_unlock(&dev->slock); 219 } 220